Add settings dialog in Tui

[fujiapple852]

Add a settings dialog to the Tui:

• The dialog will be activated with the s key binding by default
• The dialog should show the current values of all settings, perhaps in multiple tabs (trace, tui, dns etc)
• Some settings from the existing header should be removed, retaining only some very important and the non-static settings.

Current:

Config: protocol=icmp(v4) dns=google as-info=on interval=1s grace=100ms start-ttl=1 max-ttl=64 max-hosts=auto

Proposed:

Config: protocol=icmp(v4) as-info=on details=off max-hosts=auto